| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 51°F | 39°F | 7.4" |
| February | 30°F | 54°F | 41°F | 4.5" |
| March | 37°F | 63°F | 50°F | 5.4" |
| April | 45°F | 73°F | 59°F | 6.0" |
| May | 53°F | 79°F | 66°F | 9.0" |
| June | 62°F | 87°F | 74°F | 9.4" |
| July | 65°F | 88°F | 76°F | 5.3" |
| August | 65°F | 87°F | 74°F | 7.1" |
| September | 58°F | 81°F | 68°F | 5.1" |
| October | 45°F | 71°F | 57°F | 9.0" |
| November | 35°F | 62°F | 47°F | 6.8" |
| December | 32°F | 54°F | 42°F | 6.7" |
| Index | Salem | North Carolina | National |
| Air quality index | 43 | 35 | 42 |
| Pollution index | 1,564,530 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 275 |
| Days with moderate air quality | 90 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Casar, NC | 361 | 36 | 28.0% |
| Belwood, NC | 1,130 | 36 | 28.0% |
| Icard, NC | 2,119 | 43 | 14.0% |
| Morganton, NC | 16,517 | 43 | 14.0% |
| Cajah's Mountain, NC | 2,758 | 43 | 14.0% |
| Salem, NC | 1,479 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Grand Ronde, OR | 1,479 | 32 | 36.0% |
| Calvert, TX | 1,479 | 38 | 24.0% |
| Carrizo Hill, TX | 1,479 | 25 | 50.0% |
| Strong, ON | 1,479 | n/a | |
| Akron, IA | 1,478 | 35 | 30.0% |
| Salem, NC | 1,479 | 43 | 14.0% |
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